Question
Question: If the lower block is held fixed and force is applied to P, minimum horizontal force required to sli...
If the lower block is held fixed and force is applied to P, minimum horizontal force required to slide P on Q is 12 N. Now if Q is free to move on frictionless surface and force is applied to Q, then the minimum force F required to slide P on Q is –
A
12 N
B
18 N
C
27 N
D
36 N
Answer
27 N
Explanation
Solution
12 = m4g ̃ m = 0.3
apmax possible = mg = 3 m/s2
F = (5 + 4) × 3 = 27 N